The paper discusses the photography of deep wells in 3-D stereoscopic pairs as used for evaluation of well conditions or formational analysis. The photographs are obtained in wells and boreholes, containing opaque fluids such as crude oil and drilling muds, by an isolation displacement technique. The discussion covers the value of such visible examination of wells and boreholes for structural evaluation of materials, geologic studies of in-situ conditions and recovery of lost equipment. Incorporated in the paper are photographs illustrating points of discussion and new techniques developed for operation below opaque fluids.

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